So, the Chinese are actually trying to get completely independent in terms of weapons, so it seems there is a huge amount of guns created there... The list will be pretty long.
Older variants:
Type 56 assault rifle, a copy of AK rifles. Might be worth including to increase variation.
Type 63 assault rifle, closer to SKS than AK, but generally a mix of various Soviet weapons. Interesting from historical standpoint.
Type 69 RPG, because there is never enough rocket launchers.
Type 77 pistol, which is being phased out now, meaning there should be a large amount of those for sale in the near future.
Type 77 HMG, which fires 12.7mm cartridge, and is quite large.
Type 79 SMG, firing 7.62x25 Tokariev, considered a good CQB weapon.
Type 80 MG, using standard Soviet 7.62 WP cardridge.
Type 81 AR, another one created as a mix of various Soviet designs.
Type 87, the drum-fed automatic grenade launcher, using 35 mm grenades.
Newer variants:
95 family, consisting of AR (QBZ-95), squad automatic weapon (QBB-95) and carabine (QBZ-95B), using Chinese 5.8mm cartrige; also, 97 family for exports, using 5.56 NATO round, with QBZ-97, QBZ-97B and QBB-97.
88 'family' consisting of QBU (marksman rifle) and QJY (LMG), both also firing 5.8 mm cartridge.
QBZ-03, non-bullpup AR for 5.8 mm cartridge.
QCW-05, silenced SMG using shorter 5.8mm cartridge.
QSW-06, pistol using the same short 5.8x21mm cartridge as QCW-05.
JS 7.62, sniper rifle using older, 7.62x54 mm cartridge, quite modern - created in 2005.
I'm especially fond of modern variants of Chinese weapons, and those might be more popular than one would think due to their appearances in Battlefield series installations; I'm pretty sure most of those are in BF4, and some are present in BF3.